Impact tool



Oct. 2, 1945.

Filed my 6, 1942 ,M flfl w M I 1% 6L 5/4 Zvm Z, m llmm a W a 6 Z a a 2 h 5 2 Patented Oct. 2, 1945 sm n N- Br, a s s rt Su 1;

.1, livan Machinery C ompanyy. acorporationnf i esse lisssfti -Application Maya 1942,- Serial Nos-142,001 seam I -me s) This invention relates to -im'p'act tools', and

i more particularly toa portable-impact tool of the reciprocating hammerjpiston type having novel means for holding the separable parts'thereof in assembled relation.

In portable impact tools: there are usually provided' :sep'arable parts which are -maintainedin assembledrelationby tensioned sideroda iUsua-ll'y: :such tools a' pair .of' side rods is employed, arranged in. the centralfllongitudinal vertical plane of the tool, 1 ands-by such an arrangement, the "side; rods iwere found to interfere with com pactness. and resulted iniundesirable projections in or; about the supporting handle of the tool which interfered, to some extent, 'withl proper handling of the'tool. 4 Furthermore, such a side rod arrangement resulted ini'a:lt001 which was relatively wide, hindering properoperation of the tool in relatively close quarters A1so;- such:a side rod arrangement prevented. the :applicationof equally; distributed clamping pressures to the vtool parts.

,-i In the: present invention .iaii-novelcmeans is provided :for; holding the separable; tool parts in assembled relation which LIX) a" large extent :over-' comes the. disadvantages: of. the .previousrknovvn devices-p in that. the-stool iswrendered extremely compact 1 in 'w idthsand undesirable: projectionsv in and about-thentool supportingthandle are 00m!- pletelyr avoided. ;-fA-lso. by the noyeliholdingmeans provided, the separable .parts of thetoolareheld in assembled relation in a better .ma'nner,in' that greater ruggednesslis attained'ias well: as extreme lateral;,compactness.--; By thennovel hold ing means provided}. the toolsupporting handle and its mounting are enabledto be streamlined? to. a large degree, thereby making handling of thetooleasienj It is accordinglyzan object of thepresentrinventionto provide novel means .for holding the separable partsof a portable impact tool-inassembled relation which overcomes, 'to; a large .extent, the disadvantages of previously; knowmdevices. Another object is to .providera novel ten- 81911 13011? arrangement ior holdingthe separable tool parts assembled, which lends,- itself to greater compactness and ruggedness! A;,iu,rth er1 object is to provide a novel tension-bolt arrangement, whereby all undesirable projections in, and about the mounting means ;for the 1 tool; supporting handle are avoided. A still further. object is to provide anovel llboltstructure ;for holding the e a ab e-s nsor, a s pactttool inessembled WWW-j. How ese and other; Objects; are. ac: eon plished, andadvantazeouss features. :.of

the invention, will be best understood from the following detailed description wherein a preferred and illustrative embodiment is set forth; refer once for the purpose beinghad to the accompany ing drawing; in which:

Fig. 1 is a front elevational view of an impact tool constructed in accordance withan" illustrative embodiment of the invention. Fig". '2 is a side elevationalview'of'the impact toolshown'inFig;1. 1 Fig. 3 is a view iii-longitudinal vertical section, with parts in elevation," takerrsubstantially on line 33 0f Fig;2.

"Fig; 4 is a rear end view of the improved impact Fig; '5 is a cross sectional view'taken substantiallyon line5y-5-of Fig.1 i In this illustrative embodiment of: the inventionythe improved means for holding the separ able-tool parts in assembled relation is'shown embodied in a portable impact-tool of the type known as a hand-held i -buster, although'itwill be evident that the invention may be incorporated 7 bore contains a r'eciprocatoryhammer piston..5

for delivering impact blows toa tappet 6 ,reciprocably-mounted in .the front head,;and the piston blows are transmitted .by this tappet to the shank 1 vof a suitableworking implement such as a demolition pick or clay; digger. The

1 working implement has its shank mounted in a chuck 8 supported within a frontchuck housing 9 arranged atthe front end of the cylinder. A valve blocklll isarrang'ed at the rear endjof the motor cylinder and contains aconvention'al distributing valvemechanism H for distributing motive fluid to the motor cylinder to effect reciprocation of the hammer piston. Arranged rearwardly of the valve block is a supportinghead I 2 for a, handle l3 by which the-tool may" be manually supported with respectitdthe *worki Thishandle has oppositely extendingzgra'sping portions: I4, IMIying in a central longitudinal vertical: plane :of :the tool.. Suitably attached to thevalve block is a: hose. connection [5 through which motivetluid may flow to the valve mechanism H, and. this connection lies beneath one of theigrasping portions of the tool supporting handle'. 1. Suchga tool constructiontisvgenerally well knownto those skilled in the art. p .aN w refer i o vthe. ve ameans 0, 1 dine p in handling the tool to greatadvantage.

the separable parts I, 3, 4, 9, l and I 2 of the tool in assembled relation, it will be noted that the rear supporting head I2 for the handle has lateral lugs I 6, l6, relatively smooth in exterior contour and projecting from the supporting head at right angles with respect to the handle grasping portions I4, I4 at the opposite sides of the tool, and these lugs have arcuate grooves ll near the opposite sides .oi' the tool. A pair of ;U-bolts I8, I 8 extend longitudinally in parallelism at tend longitudinally along the sides of the tool cylinder and pass through perforations Min-lugs chuck housing 9. Threaded at 23 on the forward longitudinal planes in which said grasping por- .the opposite sides of the tool and have their rearward curved U-portions I 9 received in the lug grooves IT. The legs of the U-bolts ex-F tlons lie and having arcuate grooves, and U-bolts extending longitudinally in parallelism at the opposite sides of the tool body entirely within the longitudinal limits of the tool body, said U-bolts having their curved rearward U-portions received in said arcuate lug grooves in close proximity to the sides of the tool body, and having their parallel. 'leg portions extending longitudinally along the sides of the tool body through the lug perforations of the front chuck part, the sides of the motor cylinder part projecting between said leg portions and at least the one of said sides nearer "15" 22 integral with the rearward part of the front extremities of the U-bolt legs are tightening nuts I 1 24, and preferably interposed between these nuts and the chuck housing lugs 22 and surrounding the lJ bolt legs are coiled tensioning springs 25. Thenuts may be adjusted to place the springs under compression, thereby to .maintain the U bolts under tension, in an obvious manner. A downwardly sloping, piston controlled exhaust passagezfi opens through aside of the cylinder symmetricaldesign, the, tool is rendered extremelywell balanced, so that it .may be easily handled.

Alsoby the provision of the novel U-bolt arrange-;

ment, substantially equal clamping pressures are applied to the-tool parts,-,-resulting in a better holdingxaction. And-with: the exhaust passage 26 and the supply'connection l5 bisected .by 1a common plane including the axis of the cylinder and the axis .of the manual graspinghandle, a very convenient'arrangement is produced, It will furthermore-be noted, by reason of the relatively large flatareas on the sides. of the cylinder I, there are provided surfaces whichqthe leg, and particularly the knee, of the operator can engage Other advantages of the invention-will be clearlyapparent to those skilled in the art.- Y I While there is in this applicationspecifically described one embodiment which the invention may assume in practice, it will be understood that this embodiment of the same is shown'fio'r pur-' poses of illustration and thattheinvention may be modified and further embodied in'various other forms without departing from its' spirit or the scope of the appended claims. What I claim as new and desire to secure by LettersPatent is:-- V. v a p pl in a portable impact tooL-atool body ineluding .a plurality of cooperatingparts includ ingazrear handlepart, an intermediate motor cylinder part and a front Ghucklpartg-Jsaid chuck part having perforated lugs, and i said :rearvhandle part having oppositely extending grasping portions lying in-a series of parallel longitudinal planes one of which includes the longitudinal axis of the tool,'said rear handle part also-having lateral lugs located at the oppositesides of said the operator as he handles the tool providing a relativelysmooth-surface of substantial area betwe'en'said legfportions for engagement by the leg ofthe operator in manipulating the tool,and said ,U bolts-lyingin longitudinal planes parallel to any being spaced equi-distantly from the closest one of said longitudinal planes in which said grasping portions lie, said leg portions having threaded forwardfree extremities and tightening nutsthreaded on said extremities and adjustable to tension said U-bolts toclamp the tool. body parts together. r 1 1 2. Ina portable impact-tool, atool bodywineluding a plurality ofcooperatin parts includinga rear handle part, an'dntermediate motor cylinder partand afront chuck'part, saidchuck part havingperforated lugs and said rear handle part having oppositely extending. grasping pore tions lyingin. a, seriesof parallel longitudinal planes one pf which :includes' the longitudinal axis ofthetool. said rear handle part also having lateral lugslccatedat the opposite sides of said longitudinal planes, in which said: grasping .por-I tions lie and having .arcuate grooves and U- bolts extending. longitudinally. in parallelism at the opposite sides :of thentoohbody entirely within thelongitudinal limits of zthevtool bo'dy; said .U-bolts-having their curved .rearward-- U portionsreceived in said arcuate lug grooves in close proximity to .the sides of thetool body with the inner portionsof said grasping portions lying between said rearward. curved u-bolt portions with said curved .portions disposed: in=close proximity to .said grasping' portions, and having their parallel leg portions extending longitudinally along the sides of the .toolbody through the lug perforations-of the front chuck part, the sides of thev :motor cylinder part projecting between said leg portions and the side. nearer the operator when the tool is-in-use providing a-relatively smooth surface for contact with the leg ofthe operator in the handling-oi the tool, and said U-bolts lying in longitudinal planes parallel to and being spaced equi-distantly from the median one of said parallel longitudinal planes in which said grasping portions lie, said leg portions having threaded forward free extremities and tightening nuts threaded on said extremitiesand rid-'- justable to tension said'U-bolts to clamp thetool body parts together. r

7 1:3. In a portabie' impact tool, a tool body including a plurality of cooperatin partsinclud ing' a rear handle part, an intermediate motor cylinder part and a front I chuck part; said chuck partihaving: perforated lugs with the perforationsi thereof spaced equi distantly 1mm each other at, equal distances withrespeet-tothe'longitudinal-axis of the tool and said rear handle part having oppositely-extending grasping por tions lying-in a" series of parallel longitudina! planes -one- -oi which includes the-longitudinal axis-ofthe tool, said rear handle-part-"alsohav ing lateral lugs located at the opposite sides of said longitudinal planes in which said grasping portions lie and having arcuate grooves, and U- bolts extending longitudinally in parallelism at the opposite sides of the tool body entirely within the longitudinal limits of the tool body, said U-bolts having their curved rearward U-portions received in said arcuate lug grooves in close proximity to the sides of the tool body, and having their parallel leg portions extending longitudinally along the sides of the tool body through the lug perforations of the front chuck part, the sides of the motor cylinder part projecting between said leg portions and providing at least at the side of said tool which is nearer the op- JOHN C. CURTIS.

CERTIFICATE OF CORRECTION.

' Patent No. 2,585,797-

October 2, 19u JOHN c. CURTIS.

Page 2, secto any" read --to and-'-;

insert a comma; page 5, second column, line 1;,

same claim, for "TI-bolt read should be read with this A. D. 19h6. 

